Process of closing filled paper sacks



March 23 1926. 1,577,471,

F. A. KUCERA ET'AL PROCESS OF CLOSING FILL ED PAPER SACKS Filed April 10, 1924 2 Sheets-Sheet 1 March 23 192s. 1,577,471

F. A. KUCERA ET AL PROCESS OF'CLOSING FILLED PAPER SACKS Filed Pril 10,- l92 2 Sheets-Sheet 2 7 ,aa. J. 1 9

Patented Mar. 23, 1926.

UNITED STATES PATENT OFFICE.

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I PROCESS OF CLOSING FILLED PAPER SACKS.

Application filed April 10, 1924. Serial No. 705,569.

'7 To all whom z't'mag concern:

Be it known that we, and CHARLES F. RUBEL, citizens of the United States,- residing, respectively, at

Chicago, in the county of Cook, State of.

Illinois, have invented certain new and useful Improvements in Processes of Closing Filled Paper Sacks, of which the following is a. description, reference bemg had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates-to new andusefuli improvements in the method of closing afilleIsId sack, and more particularly a paper sac An object of the invention is to provide a method of stitching jfilled paper sacks, whereby" the sacks. ma be closed one another by stitchesw ich are: anchored in a fabric stri secured. to the sack by the closing stitc esand during the closing; thereof.

A further Obie 0170f the invention is to provide a method wherein the. sack togbe closed is; trimmed to a predetermined height aiten being filled, and at the time of closing', and wherein the trimmed side edges of the bag or sack are enclosed in the folded strip secured to the bag by a line of stitchin substantially parallel with the trimmed side edges.

In the drawings- Figure 1 is a: side view of a paper sack prior to the closing of the same;

Fi 2 is an end view of the sack showing the side edges brought together for closing;

Fig. 3 is a side view of the closed sack;

Fig. 4 is an end view of the closed sack; Fig. 5 is a view showing diagrammatically the steps whereby the sack is closed, said view showing the sack in side elevation, and

Fig. 6 is' a view showing one form of means for carrying out the method, said {view being taken at right angles to that of i 5. It has been a common practice prior to the present invention to close filled sacks.

by means of a line of stitching which passes through the side walls of the bag to be closed. Such a method of closing sacks, however, cannot be well used in connection with paper sacks, on account of the fact that the paper is very fragile and the FRANK A. KUoEnA stitches will easily tear through the same. It has also been'proposed to stitch a piece of fabric to a paper sack betore the sack is filled, and in such'a position on the sack that -the closing stitches can be passed through this strip. This is rather a' slow process of closing and adds to the expense of the sack.

The present method is directed to the close ingyof a paper oi the ordinary con struction without any iabric strip attached thereto during" the making of the bag or. sack. The saelr titled, after which the side walls; are brought together for clon ng.

These side are trimmed a given distanea above support on which the bag rests so that; the trimmed edges may passed into the strip guide which is capab ie. mE-foiding a stun of about the trimmed side o the bag. The folded strip and the trimmed edges are then assed through a stitching mechanism where y the sides of the strip are stitched together and the stitches pass through the paper, thus holding the side-walls of the ba in contact one with the other. The fa ric strip becomes an anchorage for the stitches and prevents said stitches from tearing through the aper.

I the content of the bag varies in quantity; the side walls oi the bag will meet at difierent heights accordingto theamount of content in the bag. The bag is, however, of suflicient height that it can be assed through a trimming mechanism and trimmed to a given height with the side edges even, regardless of the amount of content in the bag. Then again, if the bag is not directly centered underneath the closing means, the edge of one side wall owing to the position of the content in the bag might be at a different level than the other. When, however, the bag is filled and the side walls brought together over the top of the content of 'the bag and then said side walls trimmed, said walls will be even at a given distance above the support on which the bag rests so that they may be readily passed through the strip guide, and astrip folded till indicated at 1. Said sack is of the usual construction and the side facesl and 1 are brought together as shown in Fig. 2. The bag rests on the support 3 which may be movable, if desired, or the stitching mechanism may be movable, or the ba may move on its support during the stitching thereof. -The bag with the side 'walls brought together above the content therein is first directed to a trimming mechanism which includes a reciprocating trimming blade 4. This trimming blade cooperates I with a stationary blade on the support 5 and operates to cut the bag on the line a2-m of Figures 1 and 5. The cut oil strip (5 is defiected away by means of a deflector 7. The two side walls are held together by means of a presser member 8 cooperating with the support 5. A fabric strip 9 is led through a guide 10 of the English binder type Said strip when it reaches the end of the guide is inverted and leads therefrom in a direction at right angles to the direction at which the strip enters the guide (see Fig. 5). The trimmed side walls of the paper sack pass through the end recess in the guide as clearly shown in Fig. 6, and thus pass in to the ll-sha ed folded ortion ot' the fabric strip. Tie side wads of this folded strip are indicated at 9 and 9, and the U-shaped portion into which the side edges pass is indicated at 9. The stitches are formed by a needle 11 which reci rocates back and forth, penetrating the fa ric strip and the walls oil: the each located between the side taces of the strip. Thus theneedle forms a line of stitches 12 which are parallel with the cut edges of the paper sack and also parallel with the support on which the saclr rests.

It will be understood, of course, that the support and sewing head, one or the other may be adjusted for difi'erent size sacks, and after having been adjusted and properly fixed in adjusted position, the filled bag is passed through first the trimming mechanism, then the strip guide mechanism, so that the side walls are trimmed, the strip folded about the side walls, and then to the needle wherein the side faces of the strip are termed stitched together, clamping the side walls of the bag therebetween.

By the improved method described above,

together above the content in the sack,

trimming said side walls on a line parallel to and at a given distance from the support on which the sack rests while being closed, placing a fabric strip about the trimmed edge portions as said side walls are being trimmed, and simultaneously passing stitches through said fabric strip and the walls of the sack as the edges of the sack are trimmed andembraccd by the fabric strip so that the side walls of the paper sack are held clamped one against the other by a line of stitches anchored in the fabric strip and the sack closed thereby.

2. The method of closing filled'paper sacks including bringing the side walls of the sack together above the content in the sack, trimming said side walls on a line parallel to and at a given distance from the support on which the sack rests while being closed, directing the trimmed side walls of the sack through a strip guide whereby the fabric strip is folded and placed'about the trimmed edge portions of the papersaclr and simultaneously passing stitches through the fab ric strip and the walls of the sack as said strip and each leave the strip guide, so that the side walls of the paper sack are clamped by the stitches which are anchored in the fabric stri in testimony w erect, we atlix our signatures.

FRANK A. KUCERA. @HARLES 1F. RUBEL. 

